荧光法研究对-二甲氨甲基-杯[8]芳烃与二苯胺磺酸钠包结作用

用荧光法研究了水溶性对-二甲氨甲基-杯[8]芳烃与二苯胺磺酸钠的相互作用。发现当对-二甲氨甲基-杯[8]芳烃加入到二苯胺磺酸钠溶液时,二苯胺磺酸钠的荧光峰发生了明显的蓝移,荧光增强,可能的作用机理是二苯胺磺酸钠中的磺酸根与对-二甲氨甲基-杯[8]芳烃中带正电的氮原子之间有较强的静电作用,二苯胺磺酸钠进入了对-二甲氨甲基-杯[8]芳烃的疏水空腔。同时研究了几种有机溶剂对包结物的荧光强度的影响,初步探讨了其作用机理。     

CO+分子离子彗尾带系在近红外区域的光谱研究

CO 分子离子是一种重要的瞬态自由基分子,许多研究者对该带系进行了大量的研究。文章采用光外差-磁旋转-速度调制光谱技术测量了12C16O 分子离子彗尾带系(A2Πi-X2Σ )在近红外区域的3个支带(0,3),(1,4)和(3,6)的振转吸收光谱。利用最小二乘法拟合,得到了上态A2Πi(ν′=0,1,3)的精确的分子常数。进一步验证了光外差-磁旋转-速度调制光谱技术在吸收光谱测量中的优越性。     

Dynamic Scaling of Ramified Clusters Formed on Liquid Surfaces

A comprehensive simulation model -deposition,diffusion, rotation, reaction and aggregation model is presented to simulate the formation processes of ramified clusters on liquid surfaces, where clusters can diffuse and rotate easily. The mobility (including diffusion and rotation) of clusters is related to its mass, which is given by Dm = Dos-γD and θm =′θos-γθ, respectively. The influence of the reaction probability on the kinetics and structure formation is included in the simulation model. We concentrate on revealing dynamic scaling during ramified cluster formation. For this purpose, the time evolution of the cluster density and the weight-average cluster size as well as the cluster-size distribution scaling function at different time are determined for various conditions. The dependence of the cluster density on the deposition flux and time-dependence of fractal dimension are also investigated. The obtained results are helpful in understanding the formation of clusters or thin film growth on liquid surfaces.     

X波段介质和金属膜片混合加载行波加速结构的传播特性计算及模型腔的有关研究

计算了X波段(f=9.37GHz)介质和金属膜片混合加载行波加速结构的TM₀₁模和HEM₁₁模的色散曲线, 结果表明HEM₁₁模的截止频率比TM₀₁模的低, 说明与盘荷波导相比, 该种新加速结构单束团的BBU效应得到改善.实验研究优选得到了适用于该种新加速结构的介质(ε_r=5.812). 采用MAFIA程序优化设计了模型腔, 测试频率与设计的数值吻合得很好.     

基于OSLO的无限远像距消色差显微物镜的设计

共焦激光扫描显微镜对物镜有高分辨率、易于实现纵向扫描的要求,为此设计了高分辨率6片式无限远像距显微物镜.它的前置物镜与辅助物镜之间具有一段平行光路,因此容易实现轴向扫描.根据使用要求总体计算该物镜的外形尺寸,以像差理论为基础选择6片式的消色差物镜初始结构,用专业光学设计软件OSLO对物镜和辅助物镜进行设计和像质分析.设计结果显示,独特的6片式结构的20×物镜分辨率达到了800 lp/mm,符合共焦显微镜的使用要求.     

Elastic Transfer Reactions of 25MeV/u 6He on 9Be Target

Angular distributions for elastic transfer in the ⁶He+⁹Be system were measured at the incident ⁶He laboratory energy of E=150MeV. From a distorted-wave Born approximation (DWBA) analysis,³He spectroscopic amplitude in ⁹Be were extracted and compared with values obtained by shell model calculations. The result shows that the spectroscopic amplitude is much greater than 0.70.     

基于HI-13串列加速器在束γ终端原子核激发态寿命测量的核结构研究

利用在HI-13串列加速器的在束γ终端上建立的多普勒线移衰减法、反冲距离多普勒线移法和快时间延迟符合法等3种寿命测量方法,开展了原子核手征对称性、磁转动等核结构热点课题的研究工作。实验结果表明,130Cs的伙伴带具有很好的手征特性,而106Ag的候选带并非手征双带。根据测量的能级寿命提取的B（M1）值表明,106Ag的正宇称晕带和107Ag的正、负宇称晕带都具有典型的磁转动特性。此外,寿命测量数据还为解释和理解不同的同位素链中展现出的形状演化、形状共存、形状相变及临界点对称性等物理现象提供了有价值的实验证据。 The significance and principle of lifetime measurements of excited states in nuclei are briefly described. By using the recoil-distance Doppler-shift method, the Doppler-shift attenuation method, and the fast-timing technique established at the in-beam γ terminal of HI-13 tandem accelerator, nuclear structure studies on topical subjects including chiral symmetries and magnetic rotation have been performed. Our experimental results indicate that 130Cs shows better chiral characteristics, however, the two candidate bands of 106Ag could not be a pair of chiral doublet bands. For magnetic rotation, the deduced B(M1) values deduced from the measured level lifetimes clearly demonstrate that the yrast positive-parity band in 106Ag and both the yrast positiveand negative-parity bands in 107Ag are magnetic rotation bands. In addition, our lifetime measurement data also provide valuable experimental evidences for the interpretation and understanding of the shape evolution, the shape coexistence, and the critical-point symmetries of shape phase transition in the different isotope chains.     

对物体沿散斑片纵向移动二次曝光全息干涉条纹的诠释

从光学几何关系出发,推导了在平行光照明、物体沿散斑片纵向方向微小移动情况下的一种全息干涉条纹的解释方法.该方法可以根据任一瞬间的条纹间距测量物体的位移,并适用于实时全息监测的定量分析,对全息干涉计量术提供有效的条纹解释方法和物体位移的计算方法.     

Spatial Chaos of Bose-Einstein Condensates in a Cigar-Shaped Trap

The spatial chaos of Bose-Einstein condensates in a cigar-shaped trap is studied. For a system with a steady current, we construct the general solution of the 1st-order equation. From the boundedness condition of the general solution, we obtain the Melnikov function predicting the onset of chaos. The unpredictability of the system's distribution of atom density is also theoretically analyzed. For a 23Na system meeting the perturbation condition, numerical simulations show the existence of chaos, which is in accordance with our analytical results. Numerical simulations of a 87 Rb system dissatisfying the perturbation condition also demonstrate that there exists chaos in the system. The case without a current is also investigated.     

光信息科学与技术专业的建设

就光信息科学与技术专业建设的专业定位、课程设置、学生毕业后的去向等问题发表了个人的看法。介绍了在这方面的一些做法,提供了有关数据,可供同类专业的建设参考。